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Laurelite

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Formula:
Pb7F12Cl2
System:
Hexagonal
Colour:
Colourless
Hardness:
2
This page provides mineralogical data about Laurelite.

Classification of Laurelite

Approved 1988
3.DC.20

3 : HALIDES
D : Oxyhalides, hydroxyhalides and related double halides
C : With Pb (As,Sb,Bi), without Cu
9.2.10.1

9 : NORMAL HALIDES
2 : AX2
8.8.3

8 : Halides - Fluorides, Chlorides, Bromides and Iodides; also Fluoborates and Fluosilicates
8 : Halides of Pb
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Type Occurrence of Laurelite

Year of Discovery:
1988

Physical Properties of Laurelite

Silky
Diaphaneity (Transparency):
Transparent
Colour:
Colourless
Streak:
white
Hardness (Mohs):
2
Cleavage:
Imperfect/Fair
{0001}imperfect
Fracture:
Conchoidal
Density:
7.65(5) g/cm3 (Measured)    7.77 g/cm3 (Calculated)
Comment:
calculated from formula and structure in Merlino et al. (1996)

Crystallography of Laurelite

Crystal System:
Hexagonal
Class (H-M):
6 - Trigonal Dipyramidal
Space Group:
P6
Cell Parameters:
a = 10.267(1) Å, c = 3.9844(4) Å
α = 90°, β = 90°, γ = 120°
Ratio:
a:c = 1 : 0.388
Unit Cell Volume:
V 363.73 ų
Z:
1
Morphology:
Felted aggregates of acicular prisms

Optical Data of Laurelite

Type:
Uniaxial (+)
RI values:
nω = 1.903 nε = 1.946
Max Birefringence:
δ = 0.043
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Very High

Chemical Properties of Laurelite

Formula:
Pb7F12Cl2
Essential elements:
All elements listed in formula:
Empirical Formula:
Pb0.97F1.68Cl0.25(H2O)0.07 (Merlino et al, 1996)

Relationship of Laurelite to other Species

3.DC.05LaurionitePbCl(OH)
3.DC.05ParalaurionitePbCl(OH)
3.DC.10FiedleritePb3FCl4(OH) · H2O
3.DC.15PenfielditePb2Cl3(OH)
3.DC.25Bismoclite(BiO)Cl
3.DC.25Daubréeite(BiO)(OH,Cl)
3.DC.25MatlockitePbFCl
3.DC.25RorisiteCaFCl
3.DC.25Zavaritskite(BiO)F
3.DC.25ZhangpeishaniteBaFCl
3.DC.30NadoritePbSbClO2
3.DC.30PeritePbBiClO2
3.DC.35AravaipaitePb3F3[AlF6] · H2O
3.DC.37CalcioaravaipaitePbCa2AlF9
3.DC.40ThorikositePb3Cl2(OH)(SbO3,AsO3)
3.DC.45MereheaditePb47Cl25(OH)13O24(CO3)(BO3)2
3.DC.50BlixitePb2(O,OH)2Cl
3.DC.55PinalitePb3WO5Cl2
3.DC.60SymesitePb10(SO4)O7Cl4 · H2O
3.DC.65EcdemitePb6Cl4(As2O7)
3.DC.65HeliophyllitePb6Cl4(As2O7)
3.DC.70MendipitePb3Cl2O2
3.DC.75DamaraitePb3Cl(OH)O2
3.DC.80OnoratoiteSb8Cl2O11
3.DC.85CotunnitePbCl2
3.DC.90PseudocotunniteK2PbCl4
3.DC.95BarstowitePb4Cl6(CO3) · H2O
8.8.1AbhuriteSn21Cl16(OH)14O6
8.8.2MatlockitePbFCl
8.8.4CotunnitePbCl2
8.8.5MendipitePb3Cl2O2
8.8.6DamaraitePb3Cl(OH)O2
8.8.7LaurionitePbCl(OH)
8.8.8ParalaurionitePbCl(OH)
8.8.9PenfielditePb2Cl3(OH)
8.8.10FiedleritePb3FCl4(OH) · H2O
8.8.11BlixitePb2(O,OH)2Cl
8.8.12PseudocotunniteK2PbCl4
8.8.13DiaboleitePb2CuCl2(OH)4
8.8.14PseudoboleitePb31Cu24Cl62(OH)48
8.8.15ChloroxiphitePb3CuO2Cl2(OH)2
8.8.17BideauxitePb2AgCl3(F,OH)2
8.8.18BoleiteKPb26Ag9Cu24(OH)48Cl62
8.8.19AravaipaitePb3F3[AlF6] · H2O
8.8.20YedlinitePb6Cr3+Cl6(O,OH,H2O)8
8.8.21KolaritePbTeCl2
8.8.22HematophanitePb4Fe3O8(OH,Cl)

Other Names for Laurelite

Name in Other Languages:
German:Laurelit
Spanish:Laurelita

Other Information

Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Laurelite

Reference List:
Kampf, A.R., et al (1989), Grandreefite, pseudograndreefite, laurelite, and aravaipaite: Four new minerals from the Grandreef mine, Graham Co., AZ, American Mineralogist: 74: 927-933.

Merlino S., Pasero M., Perchiazzi N., Kampf A.R.(1996): Laurelite: its atomic structure and relationship to a-PbF2. American Mineralogist: 81: 1277-1281.

Internet Links for Laurelite

Localities for Laurelite

map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Greece
 
  • Attikí Prefecture (Attica; Attika)
    • Lavrion District (Laurion; Laurium)
      • Lavrion District Mines
        • Megala Pefka area
          • Megala Pefka Mines
Lapis, 24, 7/8 (1999)
Italy
 
  • Veneto
    • Vicenza Province
      • Torrebelvicino
        • Mercanti Valley
Zordan, A., Rocchetti, I., Gentile, P., Boscardin, M., Zorzi, F. (2011): Laurelit vom Monte Trisa, Valle dei Mercanti, Veneto, Italien. Mineralien Welt, 22(3), 58-60.
Zordan, A., Rocchetti, I., Gentile, P., Boscardin, M., Zorzi, F. (2011): Laurelit vom Monte Trisa, Valle dei Mercanti, Veneto, Italien. Mineralien Welt, 22(3), 58-60.
"Giorgio Bortolozzi (visual identification)"
USA
 
  • Arizona
    • Graham Co.
      • Aravaipa District
        • Santa Teresa Mts
          • Klondyke
            • Grand Reef Mountain
              • Laurel Canyon
Anthony, J.W., et al (1995), Mineralogy of Arizona, 3rd.ed.: 118, 272; Kampf, A.R., et al (1989), Grandreefite, pseudograndreefite, laurelite, and aravaipaite: Four new minerals from the Grandreef mine, Graham Co., AZ, Am.Min.: 74: 927-933; Min.Rec.: 27: 297.
Mineral and/or Locality  
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